I guess one more thing to consider - and something the bones might have something directly to say something about - is the longevity of teeth.
I would think that a toothless primitive man would be pretty much of a goner. And there would probably be all sorts of reasons to lose teeth.
I think Inuit would get cast out on the ice floes when they lost their teeth.
If you tended to lose your teeth around age 30 that would probably have a good deal to do with longevity.
Probably the transition from hunter-gatherer to agriculturalist would change the entire survival equation.
Maybe the main problem with teeth is, when they get a hole and infected, they’ll eventually absess and kill the person — and pulling the bad tooth is not without the same kinds of risks. The rise of toolmaking probably was the result of trying to protect the teeth, it wouldn’t take a genius to figure out what happened to the guy or girl in the tribe who cracked a tooth on a shell, bone, or stone.